<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Promise.reject()</title>
</head>

<body>
    <script>
        const promise = Promise.reject('err');
        promise.catch(res => {
            console.log(res);
        });
    </script>
</body>

</html>